style: add prettier

.eslintrc

@@ -1,29 +1,13 @@
 {
-  "extends": "eslint:recommended",
+  "extends": ["prettier"],
+  "plugins": ["prettier"],
   "env": {
-    "es6": true,
-    "jest": true,
-    "node": true
+    "es6": true
   },
   "parserOptions": {
     "ecmaVersion": 8
   },
   "rules": {
-    "indent": [
-      "error",
-      2
-    ],
-    "linebreak-style": [
-      "error",
-      "unix"
-    ],
-    "quotes": [
-      "error",
-      "single"
-    ],
-    "semi": [
-      "error",
-      "always"
-    ]
+    "prettier/prettier": "error"
   }
 }

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "arrowParens": "always",
+  "singleQuote": true
+}

package.json

@@ -4,16 +4,9 @@
   "description": "An express middleware validator.",
   "author": "Roberto Achar <robertoachar@gmail.com>",
   "homepage": "https://github.com/robertoachar/whoops#readme",
-  "keywords": [
-    "node-js",
-    "express",
-    "middleware",
-    "validator"
-  ],
+  "keywords": ["node", "express", "middleware", "validator"],
   "main": "src/index.js",
-  "files": [
-    "src"
-  ],
+  "files": ["src"],
   "scripts": {
     "coverage": "jest --colors --coverage",
     "coveralls": "npm run coverage && cat ./coverage/lcov.info | coveralls",
@@ -31,11 +24,14 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "@types/jest": "20.0.6",
-    "coveralls": "2.13.1",
-    "eslint": "4.3.0",
-    "jest": "20.0.4",
-    "nodemon": "1.11.0"
+    "@types/jest": "22.1.3",
+    "coveralls": "3.0.0",
+    "eslint": "4.18.0",
+    "eslint-config-prettier": "2.9.0",
+    "eslint-plugin-prettier": "2.6.0",
+    "jest": "22.3.0",
+    "nodemon": "1.15.1",
+    "prettier": "1.10.2"
   },
   "license": "MIT"
 }